Other Parts Discussed in Thread: DRV8844
Hi Team,
How to drive integrated capacitor Motor?
How to modify. Below schematics?
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Hi Kevin,
How to drive integrated capacitor Motor?
It is just an ordinary brushed DC motor with cap on the terminals to filter the brushes/commutator arcing noise. Just treat it like any normal brushed motor.
Brian
Kevin,
Brian in correct. The only concern is if the capacitance is too large, the DRV8962 can trip over-current protection (OCP) when the outputs switch and the capacitor is charged. I.= Cdv/dt. "I" can't exceed the OCP specification in the datasheet.
That is why I asked if you were having any issues.
Regards,
Ryan
Hi Kevin,
Ryan is out of the office today. He will reach to you when he gets back to the office.
Regards,
Pablo Armet
Hi,
Do you have a Capacitor suggested value?
Does the motor have the 2 caps 0.47uF on it already? If not, why do you need them for what purpose? This will help to decide the cap value.
Brian
It has already been installed. Purpose: The motor manufacturer recommended it to be installed by the laboratory debug technician in order to pass the EMC test. We do not want to modify the capacitor value because the motor manufacturer must send it to the EMC for re-calibration.
If it is modified from the hardware circuit of DRV8962, or if the software program is modified, is it possible to operate normally? DRV8844 can drive this motor, as shown in the attached waveform.
Do you have a Capacitor suggested value?
It has already been installed. Purpose: The motor manufacturer recommended it to be installed by the laboratory debug technician in order to pass the EMC test. We do not want to modify the capacitor value because the motor manufacturer must send it to the EMC for re-calibration.
If you don't want to modify the cap value, then why asking for suggestion of cap value?
The driver should be able to drive these cap fine.
Brian